2 General Information about Integrated Safety Systems
11.03
2.12 Error analysis
© Siemens AG 2003 All Rights Reserved
2-48
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Table 2-13
Error analysis in automatic mode
Assumed error
Error causes
Error control
MDIR, Appendix
1)
Comments
Spindle or axis
speed/velocity too
high
Defect in the drive
or control system,
encoder fault in
2-encoder
operation,
operator error, part
program error or
similar
Safe limitation of speed
or axis velocity with SG;
configurable stop
functions according to
Cat. 2
Chapter 1.2.4
Chapter 1.2.7
Chapter 1.3.6
According to the status
of the various Standards
(TC143), the SG function
is only permissible with
effective
protective devices and
equipment
(e.g. protective doors)
Axis or spindle
has inadmissibly
moved away from
standstill position
Defect in the drive
or control system,
operator error, part
program error, or
similar
Safe standstill
monitoring for position
control with SBH;
configurable stop
function, Cat. 0/1
Chapter 1.2.6
Chapter 1.2.7
Chapter 1.3.6
Chapter 1.4.2
Chapter 1.4.3
Low-wear safe shutdown
of the energy feed to the
motor to allow manual
interventions in the
hazardous zone (safe
location).
Safe standstill with SH
Stop function according
to Category 0
This function does not
replace the main
machine breaker
regarding electrical
isolation
Axes have
inadmissibly
exited operating
range
Defect in the drive
or control system,
operator error, part
program error or
similar
"Safe software limit
switches" SE;
configurable stop
functions according to
Cat. 2
Chapter 1.2.4
Chapter 1.2.7
Chapter 1.3.7
Chapter 1.3.8
Wear-free safe limit
switch,
Is essentially used for
machinery protection,
can also be used to
restrict working zones in
conjunction with
personnel protection
Response of the
machine control to
incorrect position
signal
Defect in the control,
operator error, part
program error or
similar
"Safe software cams"
SN;
safe signal and position
data output
Chapter 1.2.4
Chapter 1.2.7
Chapter 1.3.8
Chapter 1.4.2
Chapter 1.4.3
Wear-free, "safe
software cams" for
reliable detection of axis
positions,
can be used to
demarcate physical
areas
Error relating to
the input/output of
process data
Defective cable,
incorrect
information, or
similar
Two-channel input/
output of safety-relevant
signals (SGE/SGA),
crosswise data
comparison; initiation of
stop functions
according to Cat. 1
Chapter 1.2.5
Chapter 1.3.8
Chapter 1.4.2
Chapter 1.4.3
External two-channel
inputs or further
processing required if
function is intended to
protect operating
personnel
Table 2-14
General error analysis
Assumed error
Error causes
Error control
MDIR, Appendix
1)
Comments
Error has not
been detected
because function
is not active
Defect in the drive
or control system or
similar
Time-controlled request
or automatic forced-
checking procedure and
crosswise data
comparison, initiation of
stop functions according
to Cat. 0
Chapter 1.2.7
Forced-checking
procedure must be
supported by the user
depending on the
process
Incorrect safety
machine data
(MD)
Incorrect
information,
operator error or
similar
Visual check with Accept
softkeys, crosswise data
comparison, checksum,
initiation of stop functions
according to Cat. 0/1
Chapter 1.2.7
Must be confirmed using
acceptance test during
start-up
Incorrect absolute
position of axis or
spindle
Incorrect
information, axis
mechanically
influenced or
similar
User agreement
after referencing or after
power-up
Chapter 1.2.7
Chapter 1.3.8
The assignment to
machine zero must be
carried-out during start-
up
1)
refer to: Appendix, References General /1/
